[igraph] Get different set of neighbour nodes with very similar code - Unexpected results

[Jimmy Dubuisson]

Hello,

I try to get the set of neighbours of a given node (specified by its 
name) in R. If I do:

vb <- V(g)[V(g)$name == "v2"]
nvb <- V(g)[nei(vb)]
print(nvb$name)

I get the set of node "v2" neighbours as expected. But if I do:

nv <- function(g, id)
{
   vb <- V(g)[V(g)$name == id]
   V(g)[nei(vb)]
}

print(nv(g, "v2")$name)

I get the whole set of g nodes!? Someone could explain why?

Cheers,

Jim.